Apparatus for preparing and multiplying light copies



Sept. 4, 1923.

E. G. BRACK APPARATUS FOR PREPARING AND MULTIPLYING LIGHT COPIES Inj/enfor [rmi 6. .Brac/r IIL.

ttcrney Patented .Sept. 4, i923.

UNITED STATES PATENT-oFFica,

ERNST GOTTHILF BRACK, OF WINTERTHUR, SVVILZIlHtLAN'I).`

APPARATUS Fon PREPARING- AND MULTIPLYN-e rieur COPIES.`

Application filed March 5, 1823. Serial No. 622,967.

carrying this out comprises the spreading out ot a livingplant or partsthereof witha slight pressure, preparing from this plant y in a singlecontinued exposure ya negative on a sensitive paper such as heliographypaper which does not unfavorably ychange even when exposed a long timean produce ing from this negative any number oi positive copies in ,anycolor uponla sensitive,-

fabric.

In the apparatus for executing the method, a flexible carpet havingliexible filaments is yprovided and arranged in a heliography printingframe, for inserting and kholding a spread plant auditor tightlysnugging the sensitive paper to the plant.

The accompanying drawing shows one eonstructional example of theapparatus according to the invention, like numerals indicating likeparts throughout and Vin which- Figure 1 is an elevation of the printingframe, Y

Fig. 2 is a rear view also in elevation of Fi l, f

iig. 3 is a plan view,

Fig. 4l is a sectional view on line X-X of `ig. 5 is a sectional viewsimilar to Fig. 4

showing a sensitized paper in place,

Fig. 6 is a similar sectional view showing a method of applying thecarpet, and4 Fig. 7 is a sectional view Vsimilar to Fig. 5. Theapparatus shown on thedrawing conip prises a solid wood rameF, a glassplate E,

a biparted cover A, two holding bars G for y holding the inserted plantP and the negative paper D without pressure, and a flexible Y kcarpet Bhavingvlead filaments. The inclined guides by means of the bars Gr holdthe cover A. in position. v

1When a plant l? is to be printed, an extra thin sensitized negativeheliography paper D that is the usual sepia paper which does notunfavorably change even when exposed a long time, is laid with thesensitive face on the inner side of the glass E. The carpet B with thelead filaments is then laid upon the paper B and bothare rolled back.Hereupon the plant is pushed with its lower end under the roller B D.Then the parts' oi the plant adjacent to the roller B D are `r broughtin that position on the glass plate which is desired in the image,whereupon the'carpet is suitably unroll'ed together with the negativepaper. The weightk of the lead carpet insures an equal `pressure andwill snugly hold thepaper to the plant and the plant to the glass plate.When the plant has been carefully inserted, the apparatus is closed bymeansoi the cover A, and the bars G, `but without exerting a sensiblepressure. Then the negative is exposed to any suitable light rays untileven the finest structural parts of the plant begin to be marked. `Whenthe exposure is ,suilicienia the copy is re- Vmoved from the apparatus,developed, ixed f and dried, and will. then be ready orprinting anynumber of positives. Figs. 5 and 7 show how a positive paper Tisinserted and printed in the trame A.

lt is however understood that any suitable material can be used for thecarpet and that any objectsL can be printed which can be adapted to aprinting frame. The essential if feature of thevflexible carpet is thatits weight will exert equal pressure at all points. l claim as myinvention: p LA flexible carpet iorlphotograp'hic apparatus having heavyflexible filaments thereon. i

2. InV an apparatus for preparing photow graphic images, `a flexiblecarpet having Hex- `ible. lilaments adapted to bev arranged in a.heliography copying frame, for inserting and holding a plant and fortightly snugging the sensitivev paper toV the `plant by Ameans of theweight of said carpet.

3. A flexible carpet for photographie apparatus having liexible metalliclilaments thereon.

Il. A flexible carpet for photographie ap- 5 paratus having flexiblelead larnents there- 5. An apparatus for preparing plant imagescomprising a frame provided with a glass plate; a lexible carpet havingflexible 10 lilainents thereon adapted to exert equal pressure by Weightat all points against said glass plate for inserting and holding a plantand for tightly snugging the Sensitive paper to the plant by means otthe Weight ol" said carpet; and a cover vfor said frame.

In testiniony whereof l have allixed my signature in presence of twoWitnesses.

ERNST GGTTHILF BRACK. Witnesses:

Jamas It. W iLxlNsoN, GHR. VILTIER.

